@changes of wordfinal r

This page should be actually titled "changes of wordfinal r र् and of most s स्".

For words that end in as अस् and are before vowel or /haz, see changes of wordfinal as.

For words that end in As आस् and are before vowel or /haz, see changes of wordfinal aas.

All other words that end in s स् change their s स् into r र् by sasajuSoruH and afterwards follow the rules for final r र् explained below.

r र् before pause

r र् → /H by kharavasAn...

**punar पुनर् + pause → punaH पुनः

**azvas अश्वस् + pause → azvaH अश्वः

r र् + vowels OR /haz —

r र् stays, because no rule changes it

punarabravIt पुनरब्रवीत्

r र् + ts त्स् ps प्स् kS क्ष् —

r र् → /H by zarparevis...

**puruSaHtsarukas पुरुषःत्सरुकस् "the man's good with a sword"

r र् + k क् kh ख्

r र् → /H OR /K, by kupvoKkaFpauca

**kaHkrandati कःक्रन्दति "who cries?"

**kaKkrandati क⩆क्रन्दति "who cries?"

r र् + p प् ph फ्

r र् → /H OR /F, by kupvoKkaFpauca

**kaHpazyati कःपश्यति "who sees?"

**kaFpazyati क⩆पश्यति "who sees?"

r र् + r र्

first delete the first r र् by rori

then lengthen the a अ i इ u उ that was before the r र्, by DhralopepUrv...

**punArakSati पुनारक्षति "protects again"

**RSIramate ऋषीरमते "seer has fun"

The r र् of **gir- गिर् + /sup' → **gIrSu गीर्षु is technically padafinal, so why doesn't your pseudorule "r- र्> s स् before s स्" apply to it?

No, it must not apply, because the exception rossupi debars kharavasAn... in that case.

The changes below apply to words that end in true r such as **punar पुनर्,
and also to words that end in a s स् that is not part of as अस् or As आस्,
and also to words that end in as अस् As आस् and are before /khar pause.